Ergonomic and functionally-efficient one-hand user input interface



FIG. 1 is a top perspective view of an ergonomic and functionally-efficient one-hand user input interface showing our new design;

FIG. 2 is a top plan view thereof.

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a left side elevational view thereof.

Broken lines (if any) showing the environment in any figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an ergonomic and functionally-efficient one-hand user input interface, as shown and described. 